Massachusetts' chief medical examiner says a Duke University student whose body was found in woods near his home died of hypothermia.

Twenty-year-old Michael Doherty, of Franklin, was found dead last month in dense woods and thick underbrush near Interstate 495.

The medical examiner says he died due to prolonged exposure to the cold.

Massachusetts' chief medical examiner say the death of 20-year-old Duke student Michael Doherty, pictured above, was an accident. His body was found in woods after a house party

Doherty was a rising junior in the Pratt School of Engineering and a member of the Alpha Tau Omega fraternity at Duke

'We find no evidence of foul play in Mr. Doherty's death,' said Michael Morrissey, Norfolk County District Attorney, in a statement Friday. 'Our thoughts are very much with the Doherty family as they grieve Michael and live through this tragic time.'

Doherty was last seen leaving a party in the early morning of May 14, about a quarter mile from where he was found.

The Franklin Police Department found his shirt and one of his sneakers was found on a section of road being extended.

The other shoe was found a few hundred yards away by State Police.e.

His disappearance sparked a nearly week-long search of swampy areas of Franklin and neighboring Bellingham.

The operation was hampered by inclement weather, which made it impossible to deploy a helicopter to search for him from the air.